Remove mention of recursive aliases from error message

all aliases are non recursive

src/alias.ml

@@ -65,7 +65,7 @@ let dep_rec ~loc ~file_tree t =
           ~else_:(Build.arr (fun x -> x)))
     >>^ fun is_empty ->
     if is_empty && not (is_standard name) then
-      Loc.fail loc "This recursive alias is empty.\n\
+      Loc.fail loc "This alias is empty.\n\
                     Alias %S is not defined in %s or any of its descendants."
         name (Path.to_string_maybe_quoted path)
 

test/blackbox-tests/test-cases/aliases/run.t

@@ -13,7 +13,7 @@
   running in src
   $ $JBUILDER build -j1 --root . @plop
   File "<command-line>", line 1, characters 0-0:
-  Error: This recursive alias is empty.
+  Error: This alias is empty.
   Alias "plop" is not defined in . or any of its descendants.
   [1]
   $ $JBUILDER build -j1 --root . @truc/x